Just installed this and noticed a few things:
1. The Hotfix #4 Beta installed fine, didn't report any problems. I got the message "you've updated your kernel and must now reboot" .. however, the menu had *no* option to reboot any more - in fact it seems that all items on the menu, *except* those placed there by a .PND, were gone after the update. I could not reboot using the normal "log out"->Reboot option .. instead, I alt-f2'ed, typed "xterm" and then "sudo reboot" .. this reboot worked.
2. During the *next* bootup, the Angstrom bootsplash screen came up, and has taken about 10 minutes to boot so far .. at first I thought it was completely borked, when the scroll bar just froze at about 2/3rds of the way through the progress .. but I just noticed it jumped a bit just now.. and now there is a "centimeter" of boot progress bar left to get through, the bar is stuck run under the O of ZAXXON in the "Release 1 - "Zaxxon" line, and its not going anywhere. No SD light activity, no wifi activity, etc.. just .. stuck. I'm going to let it sit there all day, maybe its going to time out doing something - my Wifi was configured and working fine before the boot, but the Wifi itself is not available (I'm not at work) .. maybe its just timing out trying to get my wifi connected. I'll let it sit for 30 minutes more or so before I consider rebooting it .. I have *no* idea what its doing.
EDIT: The screen just went blank, and is not responding to anything. No activity LED's - just the two rightmost LEDs are on [red][green] (I've got power connected). The Pandora will not respond to anything, the screen is just blank - screen is on, backlight is on, but it just took the splash screen away. I'll let it sit a while longer before I force-reboot without SD cards in, in case its something to do with an fsck or something ..